Sanding device.



A. E. HUDSON.

SANDING DEVICE.

APPLIOATION FILED 1150.1, 1913.

1,1 13,557. v Patented @01.13.1914.

HTIVS THE NORRIS PETERS CO., PHOTO-LIT'HQ. WSHINCIUN. D. C.

ALBERT EDMUND HUDSON, 0F CALGARY, ALBERTA, CANADA.

SANDIN G DEVICE.

Specification of Letters Patent.

Patented Oct. 13, 1914.

Application filed December 1,1913. Serial N o. 804,055.

T0 all whom it may concern Be it known that I, ALBERT EDMUND HunsoN, asubject of the King of Great Britain, and resident of Calgary, in theProvince of Alberta, Dominion of Canada, have invented certain new anduseful Improvements in Sanding Devices, of which the following is thespecification.

This invention relates to improvements in sanding devices such as areused in locomotives, and the object of the invention is to automaticallyapply sand to the rails when the air brake is being applied to thetrain, such application of sand being performed simultaneously with theoperation of the brakes, and it consists essentially of the improvedvalve and pipe arrangement hereinafter particularly described byreference to the specification and drawing.

The figure is a view of the device, part of which is in section, showingthe automatic controlling valve.

Referring to the drawing, D represents the improved sanding device whichis connected directly to the air reservoir through the pipe leading fromthe T-piece and on that side of it directly opposite the pipe 76. Theair reservoir which is of the usual type found in railway practice andnot forming a part of this invention, except in so far as to be a sourceof supply, is not described or shown.

70 represents the sanding pipe extending to the usual sander (not shown)and the direct admission of compressed airv to such pipe is co-ntrolledby the hand valve 7l. A bypass is provided according to the presentinvention by means ofa casing member 72 havin@ two bores 73 and 74 atright angles to each other, the bore 73 being connected by piping 74awith the sanding pipe 70 and the bore 74 being connected on one end tothe main reservoir by piping 75, the main reservoir also being connectedto the sand pipe 70 by the piping 76. The opposite end of the bore 74also connects with the train line by piping 77. A piston valve 78 isprovided in the bore 74 and is formed with an enlarged head 79 adaptedto fit an enlarged portion 80 at one end of the bore, the normalposition being as shown in Fig. 9 when the reduced portion 81 of thepiston valve normally closes the bore 73 owing to the fact that thepressure inv the train line pipe and main reservoir balance it in thisposition, the diii'erence in area of the ends of the piston valvecausing this balance to take lace.

The operation of t e device is as follows: When the brakes are appliedthe pressure in the train line is relieved and the piston valve 8l movestoward the enlarged end 80 so uncovering the bore 73, the air passingfrom the reservoir through the pipe 75, 74a

y and 70` to the sander from which the sand is delivered in the usualway. On releas `ing the brakes the air pressure in the train tion,within the scope of the claims, constructed without departing from thespirit or scope thereof, it is intended that all matter contained in theaccompanying specication and drawings shall be interpreted asillustrative and not in a limiting sense.

What I claim as my invention is:

l. A sanding device adapted to be operated by the reduction of pressurein the train line pipe and comprising a casing, bores in said casing anda piston valve mov able transversely across one of said bores, andbalanced on opposite sides by the pressure from the main reservoir andthe train line pipe, the bores being so arranged that on movement of thepiston valve by reduction of pressure in the train line pipe the` sanderwill be operated.

2. In a sanding device, the combination with the sanding device and avalve controlling the passage of air from the main reservoir to thesanding pipe, of a bypass, a valve movable transversely across saidbypass, such valve being controlled by the pressure in the train linepipe, substantially as described.

In witness whereof I have hereunto set my hand in the presence vof twowitnesses.

ALBERTEDMUN D HUDSON.

Witnesses:

RUSSEL S. SMART, P. M. GARROW.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

